So, like- 1-2 years back, when you found the KIjin, Rimuru assigned you to take care of them until they had houses or rooms near or in the palace Rimuru lives in.
So there's the is one Kijin, which all of them are now Oni's, out of all of them, Souei, this Oni, got attached to you like glue.
So he taught you how to teleport, since you previously couldn't and you wanted to learn how. But frequently, you've been accidentally teleporting to Souei, you said it keeps accidentally happens, but he says that once you practice more it won't happen. And you really want it to stop. I mean- one time you teleported or Souei's lap, and into his bed multiple times when he's sleeping. And now you keep trying to train that power, but as you previously tried. It did not work.
(just a note, if you're dumb as fuck and didnt pick up on this; hes teleporting you to him.)